Prosecution Insights
Last updated: September 25, 2026
Application No. 18/279,528

GADOLINIUM CHELATE, PREPARATION METHOD THEREFOR, AND APPLICATION THEREOF

Final Rejection §102
Filed
Aug 30, 2023
Priority
Mar 22, 2021 — CN 202110303742.1 +1 more
Examiner
PACKARD, BENJAMIN J
Art Unit
1612
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
South Medical University
OA Round
2 (Final)
67%
Grant Probability
Favorable
3-4
OA Rounds
0m
Est. Remaining
82%
With Interview

Examiner Intelligence

Grants 67% — above average
67%
Career Allowance Rate
894 granted / 1341 resolved
+6.7% vs TC avg
Strong +16% interview lift
Without
With
+15.6%
Interview Lift
resolved cases with interview
Typical timeline
2y 11m
Avg Prosecution
46 currently pending
Career history
1387
Total Applications
across all art units

Statute-Specific Performance

§101
2.1%
-37.9% vs TC avg
§103
47.9%
+7.9% vs TC avg
§102
16.1%
-23.9% vs TC avg
§112
15.6%
-24.4% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1341 resolved cases

Office Action

§102
DETAILED ACTION Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Election/Restrictions Newly amended claims 1 and 2 are directed to an invention that is independent or distinct from the invention originally claimed for the following reasons: Claims 1 and 2 are amended to now being directed to a method of performing magnetic resonance imaging on a subject. The common technical feature among the new group and the prior groups of product and process of making is the gadolinium chelated complex, which is not special as noted below. As such, unity is broken and the method is distinct from the complex and method of making the complex. Since applicant has received an action on the merits for the originally presented invention, this invention has been constructively elected by original presentation for prosecution on the merits. Accordingly, claims 1 and 2 are withdrawn from consideration as being directed to a non-elected invention. See 37 CFR 1.142(b) and MPEP § 821.03. To preserve a right to petition, the reply to this action must distinctly and specifically point out supposed errors in the restriction requirement. Otherwise, the election shall be treated as a final election without traverse. Traversal must be timely. Failure to timely traverse the requirement will result in the loss of right to petition under 37 CFR 1.144. If claims are subsequently added, applicant must indicate which of the subsequently added claims are readable upon the elected invention. Should applicant traverse on the ground that the inventions are not patentably distinct, applicant should submit evidence or identify such evidence now of record showing the inventions to be obvious variants or clearly admit on the record that this is the case. In either instance, if the examiner finds one of the inventions unpatentable over the prior art, the evidence or admission may be used in a rejection under 35 U.S.C. 103 or pre-AIA 35 U.S.C. 103(a) of the other invention. Claim Rejections - 35 USC § 102 The text of those sections of Title 35, U.S. Code not included in this action can be found in a prior Office action. Claim 21 is rejected under 35 U.S.C. 102(a)(1) as being anticipated by Unaleroglu et al (J of Applied Polymer Science, vol 56, No 10, 1995, 1239-1243). Unaleroglu et al discloses a gadolinium complexed to PVA (Table I and Scheme 1). Note, while the prior art uses organic gelation synthesis, according to scheme 1, the product appears to be the same as what would result from the instant complexation reaction. As such, it is reasonably expected that the properties of the complex form in the prior art are identical to the instantly claimed complexes, even though the prior art does not disclose them. See MPEP 2112(II). Allowable Subject Matter Claims 12 and 14-20 are allowed. While the prior art discloses what appears to be the resulting complex, there is no disclosure in the prior art which teaches direct complexation of gadolinium ion solution with a macromolecule. All the prior art examples appear to use conjugating components or intermediate products to form the complexes. Conclusion Applicant's amendment necessitated the new ground(s) of rejection presented in this Office action. Accordingly, THIS ACTION IS MADE FINAL. See MPEP § 706.07(a). Applicant is reminded of the extension of time policy as set forth in 37 CFR 1.136(a). A shortened statutory period for reply to this final action is set to expire THREE MONTHS from the mailing date of this action. In the event a first reply is filed within TWO MONTHS of the mailing date of this final action and the advisory action is not mailed until after the end of the THREE-MONTH shortened statutory period, then the shortened statutory period will expire on the date the advisory action is mailed, and any nonprovisional extension fee (37 CFR 1.17(a)) pursuant to 37 CFR 1.136(a) will be calculated from the mailing date of the advisory action. In no event, however, will the statutory period for reply expire later than SIX MONTHS from the mailing date of this final action. Any inquiry concerning this communication or earlier communications from the examiner should be directed to BENJAMIN J PACKARD whose telephone number is (571)270-3440. The examiner can normally be reached Mon 2-6pm and Tues-Fri 9:30am-6:30pm + mid-day flex. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Sahana S. Kaup can be reached at (571) 272-6897. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /BENJAMIN J PACKARD/ Primary Examiner, Art Unit 1612
Read full office action

Prosecution Timeline

Aug 30, 2023
Application Filed
Feb 10, 2026
Non-Final Rejection mailed — §102
May 11, 2026
Response Filed
Jul 13, 2026
Final Rejection mailed — §102
Sep 22, 2026
Response after Non-Final Action

Precedent Cases

Applications granted by this same examiner with similar technology

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Patent 12740923
PHARMACEUTICAL FORMULATION
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Patent 12735581
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Patent 12734247
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Patent 12721344
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2y 11m to grant Granted Sep 01, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

3-4
Expected OA Rounds
67%
Grant Probability
82%
With Interview (+15.6%)
2y 11m (~0m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 1341 resolved cases by this examiner. Grant probability derived from career allowance rate.

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